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Rutin, one of the excellent chelating agents, has been made to react with Zr4+ and MoO42- ions to get metal complexes in methanol. The synthesis, spectral properties (UV-Vis, 1H NMR, 13C NMR, IR), thermal behavior and antioxidant activity of these complexes have been studied. It has been observed that rutin forms deep yellow colored complexes of mononuclear composition (through 5OH-4CO system in case of Zr4+/catechol site in case of MoO42-) having stoichiometry, 1:2 and 1:1 for Zr4+ and MoO42- ions, respectively. It has been further noticed that these complexes are formed at different pHs, i.e. 4.0 and 8.0 pHs suitable for Zr4+ and MoO42- complexes, respectively. Thermograms also confirm the results of IR and support the presence of water molecules in complexes. Relative antioxidant activity of the rutin ligand, zirconium-rutin and molybdenum-rutin complexes was determined. It was found that both metal complexes have higher antioxidant activity than rutin alone.
Qadeer K. Panhwar, Shahabuddin Memon. (2014) Synthesis, Characterization and Antioxidant Activity of Rutin Complexes, Pakistan Journal of Analytical & Environmental Chemistry, Volume 15, Issue 2.
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